ICD-10-CM > I00-I99 > I70-I79 > I71 > I71.0 > I71.01 I71.01 Dissection of thoracic aorta Non-Billable/Non-Specific Codes I71.010Dissection of ascending aortaI71.011Dissection of aortic archI71.012Dissection of descending thoracic aortaI71.019Dissection of thoracic aorta, unspecified